<div style=" margin:10px;">
  <div class="notice">
    <strong><{t}>注意：<{/t}></strong><{t}>扫描图片分辨率请调整为 96 dpi，图片格式 jpg<{/t}></div>
  <form id="form1" enctype="multipart/form-data" action="index.php?app=ome&ctl=admin_delivery_print&act=doUploadBg" method="post">
    <{input type="sfile" id="f1" name="background" f_type="public"}>
    <input name="dly_printer_id" type="hidden" value="<{$dly_printer_id}>" />
    <{button label="上传" type="submit" id="btn-upload"}>
  </form>
</div>
<script>
  (function(){

    $('btn-upload').addEvent('click',function(){return check();});

    function check(){
      var aaa = $(document.body).getElement("input[name=background]");
      if (aaa.value == ''){
        alert("请选择图片");
        return false;
      }
      //$('form1').fireEvent('submit',{stop:function(){}});
      return true;
    }
  })()
</script>